单选题：Paragraph 5 __________

题目分类：理工类
题目类型：单选题
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题目内容：

Paragraph 5 __________ A．The main components of the maglev train system
B．High-speed maglev due to zero friction
C．The working principle of the maglev train
D．Differences between polarity and magnetic field
E．Comparison of maglev trains with traditional ones
F．Maglev with a powerful motor

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